<template>
    <div class="wrapper">
        <!-- header -->
        <header>
            <p>商家信息</p>
        </header>
        <!-- 商家logo -->
        <div class="business-logo">
            <img :src="business.businessImg">
        </div>
        <!-- 商家信息 -->
        <div class="business-info">
            <h1>{{ business.businessName }}</h1>
            <p>&#165;{{ business.starPrice }} 起送 &#165;{{ business.deliveryPrice }} 配送</p>
            <p> {{ business.businessExplain }}</p>
        </div>
        <!-- 食品列表 -->
        <ul class="food">
            <li v-for="(item, index) in foodArr">
                <div class="food-left">
                    <img :src="item.foodImg">
                    <div class="food-left-info">
                        <h3>{{ item.foodName }}</h3>
                        <p>{{ item.foodExplain }}</p>
                        <p>&#165;{{ item.foodPrice }}</p>
                    </div>
                </div>
                <div class="food-right">
                    <div>
                        <i class="fa fa-minus-circle" @click="minus(index)" v-show="item.quantity != 0"></i>
                    </div>
                    <p><span v-show="item.quantity != 0">{{ item.quantity }}</span></p>
                    <div>
                        <i class="fa fa-plus-circle" @click="add(index)"></i>
                    </div>
                    <!-- 购物车部分 -->
                    <div class="cart">
                        <div class="cart-left">
                            <div class="cart-left-icon"
                                :style="totalQuantity == 0 ? 'background- color:#505051; ' : 'background - color:#3190E8;'">
                                <i class="fa fa-shopping-cart"></i>
                                <div class="cart-left-icon-quantity" v-show="totalQuantity != 0">
                                    {{ totalQuantity }}
                                </div>
                            </div>
                            <div class="cart-left-info">
                                <p>&#165;{{ totalPrice }}</p>
                                <p>另需配送费{{ business.deliveryPrice }}元</p>
                            </div>
                        </div>
                        <div class="cart-right">
                            <!-- 不够起送费 -->
                            <div class="cart-right-item" v-show="totalSettle < business.starPrice"
                                style="background-color: #535356;cursor: default;">
                                &#165;{{ business.starPrice }}起送
                            </div>
                            <!-- 达到起送费 -->
                            <div class="cart-right-item" @click="toOrder" v-show="totalSettle >= business.starPrice">
                                去结算
                            </div>
                        </div>
                    </div>
                </div>
            </li>
        </ul>
    </div>
</template>

<script>
export default {
    name: 'BusinessInfo',
    data() {
        return {
            businessId: this.$route.query.businessId,
            business: {},
            foodArr: [],
            user: {}
        }
    },
    created() {
        this.user = this.$getSessionStorage('user');
        //根据businessId查询商家信息
        this.$axios.get('BusinessController/getBusinessById', {
            params: {
                businessId: this.businessId
            }
        }).then(response => {
            this.business = response.data.data;
        }).catch(error => {
            console.error(error);
        });
        //根据businessId查询所属食品信息
        this.$axios.get('FoodController/listFoodByBusinessId', {
            params: {
                businessId: this.businessId
            }
        }).then(response => {
            this.foodArr = response.data.data;
            for (let i = 0; i < this.foodArr.length; i++) {
                this.foodArr[i].quantity = 0;
            }
            //如果已登录，那么需要去查询购物车中是否已经选购了某个食品
            if (this.user != null) {
                this.listCart();
            }
        }).catch(error => {
            console.error(error);
        });
    },
    methods: {
        listCart() {
            this.$axios.get('CartController/listCart', {
                params: {
                    businessId: this.businessId,
                    userId: this.user.userId
                }
            }).then(response => {
                let cartArr = response.data.data;
                //遍历所有食品列表
                for (let foodItem of this.foodArr) {
                    foodItem.quantity = 0;
                    for (let cartItem of cartArr) {
                        if (cartItem.foodId == foodItem.foodId) {
                            foodItem.quantity = cartItem.quantity;
                        }
                    }
                }
                this.foodArr.sort();
            }).catch(error => {
                console.error(error);
            });
        },
        add(index) {
            //首先做登录验证
            if (this.user == null) {
                this.$router.push({
                    path: '/login'
                });
                return;
            }
            if (this.foodArr[index].quantity == 0) {
                //做insert
                this.savaCart(index);
            } else {
                //做update
                this.updateCart(index, 1);
            }
        },
        minus(index) {
            //首先做登录验证
            if (this.user == null) {
                this.$router.push({
                    path: '/login'
                });
                return;
            }
            if (this.foodArr[index].quantity > 1) {
                //做update
                this.updateCart(index, -1);
            } else {
                //做delete
                this.removeCart(index);
            }
        },
        savaCart(index) {
            this.$axios.get('CartController/saveCart',
                // this.$qs.stringify({
                //     businessId: this.businessId,
                //     userId: this.user.userId,
                //     foodId: this.foodArr[index].foodId
                // })
                {
                    params: {
                        businessId: this.businessId,
                        userId: this.user.userId,
                        foodId: this.foodArr[index].foodId
                    }
                }
            ).then(response => {
                if (response.data.data == 1) {
                    //此食品数量要更新为1；
                    this.foodArr[index].quantity = 1;
                    this.foodArr.sort();
                } else {
                    alert('向购物车中添加食品失败！');
                }
            }).catch(error => {
                console.error(error);
            });
        },
        updateCart(index, num) {
            this.$axios.get('CartController/updateCart',
                // this.$qs.stringify({
                //     businessId: this.businessId,
                //     userId: this.user.userId,
                //     foodId: this.foodArr[index].foodId,
                //     quantity: this.foodArr[index].quantity + num
                // })
                {
                    params: {
                        businessId: this.businessId,
                        userId: this.user.userId,
                        foodId: this.foodArr[index].foodId,
                        quantity: this.foodArr[index].quantity + num
                    }
                }
            ).then(response => {
                if (response.data.data == 1) {
                    //此食品数量要更新为1或-1；
                    this.foodArr[index].quantity += num;
                    this.foodArr.sort();
                } else {
                    alert('向购物车中更新食品失败！');
                }
            }).catch(error => {
                console.error(error);
            });
        },
        removeCart(index) {
            this.$axios.get('CartController/removeCart',
                // this.$qs.stringify({
                //     businessId: this.businessId,
                //     userId: this.user.userId,
                //     foodId: this.foodArr[index].foodId
                // })
                {
                    params: {
                        businessId: this.businessId,
                        userId: this.user.userId,
                        foodId: this.foodArr[index].foodId

                    }
                }
            ).then(response => {
                if (response.data.data == 1) {
                    //此食品数量要更新为0；视图的减号和数量要消失
                    this.foodArr[index].quantity = 0;
                    this.foodArr.sort();
                } else {
                    alert('从购物车中删除食品失败！');
                }
            }).catch(error => {
                console.error(error);
            });
        },
        toOrder() {
            this.$router.push({
                path: '/orders',
                query: {
                    businessId: this.business.businessId
                }
            });
        }
    },
    computed: {
        //食品总价格
        totalPrice() {
            let total = 0;
            for (let item of this.foodArr) {
                total += item.foodPrice * item.quantity;
            }
            return total;
        },
        //食品总数量
        totalQuantity() {
            let quantity = 0;
            for (let item of this.foodArr) {
                quantity += item.quantity;
            }
            return quantity;
        },
        //结算总价格
        totalSettle() {
            return this.totalPrice + this.business.deliveryPrice;
        }
    }
}
</script>

<style scoped>
/****************** 总容器 ******************/
.wrapper {
    width: 100%;
    height: 100%;
}

/****************** header部分 ******************/
.wrapper header {
    width: 100%;
    height: 12vw;
    background-color: #0097FF;
    color: #fff;
    font-size: 4.8vw;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

/****************** 商家logo部分 ******************/
.wrapper .business-logo {
    width: 100%;
    height: 35vw;
    /*使用上外边距避开header部分*/
    margin-top: 12vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

.wrapper .business-logo img {
    width: 40vw;
    height: 30vw;
    box-sizing: border-box;
    border-radius: 20px;
}

/****************** 商家信息部分 ******************/
.wrapper .business-info {
    width: 100%;
    height: 20vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.wrapper .business-info h1 {
    font-size: 5vw;
}

.wrapper .business-info p {
    font-size: 3vw;
    color: #666;
    margin-top: 1vw;
}

/****************** 食品列表部分 ******************/
.wrapper .food {
    width: 100%;
    /*使用下外边距避开footer部分*/
    margin-bottom: 14vw;
}

.wrapper .food li {
    width: 100%;
    box-sizing: border-box;
    padding: 2.5vw;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wrapper .food li .food-left {
    display: flex;
    align-items: center;
}

.wrapper .food li .food-left img {
    width: 20vw;
    height: 20vw;
	box-sizing: border-box;
	border-radius: 10px;
}

.wrapper .food li .food-left .food-left-info {
    margin-left: 3vw;
}

.wrapper .food li .food-left .food-left-info h3 {
    font-size: 3.8vw;
    color: #555;
}

.wrapper .food li .food-left .food-left-info p {
    font-size: 3vw;
    color: #888;
    margin-top: 2vw;
}

.wrapper .food li .food-right {
    width: 16vw;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wrapper .food li .food-right .fa-minus-circle {
    font-size: 5.5vw;
    color: #999;
    cursor: pointer;
}

.wrapper .food li .food-right p {
    font-size: 3.6vw;
    color: #333;
}

.wrapper .food li .food-right .fa-plus-circle {
    font-size: 5.5vw;
    color: #0097EF;
    cursor: pointer;
}

/****************** 购物车部分 ******************/
.wrapper .cart {
    width: 100%;
    height: 14vw;
    position: fixed;
    left: 0;
    bottom: 0;
    display: flex;
}

.wrapper .cart .cart-left {
    flex: 2;
    background-color: #505051;
    display: flex;
}

.wrapper .cart .cart-left .cart-left-icon {
    width: 16vw;
    height: 16vw;
    box-sizing: border-box;
    border: solid 1.6vw #444;
    border-radius: 8vw;
    background-color: #3190E8;
    font-size: 7vw;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: -4vw;
    margin-left: 3vw;
    position: relative;
}

.wrapper .cart .cart-left .cart-left-icon-quantity {
    width: 5vw;
    height: 5vw;
    border-radius: 2.5vw;
    background-color: red;
    color: #fff;
    font-size: 3.6vw;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    right: -1.5vw;
    top: -1.5vw;
}

.wrapper .cart .cart-left .cart-left-info p:first-child {
    font-size: 4.5vw;
    color: #fff;
    margin-top: 1vw;
}

.wrapper .cart .cart-left .cart-left-info p:last-child {
    font-size: 2.8vw;
    color: #AAA;
}

.wrapper .cart .cart-right {
    flex: 1;
}

/*达到起送费时的样式*/
.wrapper .cart .cart-right .cart-right-item {
    width: 100%;
    height: 100%;
    background-color: #38CA73;
    color: #fff;
    font-size: 4.5vw;
    font-weight: 700;
    user-select: none;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
}

/*不够起送费时的样式（只有背景色和鼠标样式的区别）*/
/*
.wrapper .cart .cart-right .cart-right-item{
width: 100%;
height: 100%;
background-color: #535356;
color: #fff;
font-size: 4.5vw;
font-weight: 700;
user-select: none;
display: flex;
justify-content: center;
align-items: center;
}
*/
</style>